Method and device for efficiently operating sl drx in nr v2x

ABSTRACT

A method of operating a first device 100 in a wireless communication system is proposed. The method may comprise: generating a MAC PDU related to a groupcast transmission; and selecting at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in a resource pool, wherein a first SL resource included in the at least one SL resource is included in a first SL DRX active time, and the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

CROSS-REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. § 119, this application claims the benefit of U.S. Provisional Application No. 63/230,053 filed on Aug. 5, 2021, No. 63/230,690 filed on Aug. 6, 2021, Korean Patent Application No. 10-2021-0103723 filed on Aug. 6, 2021 and No. 10-2021-0104096 filed on Aug. 6, 2021, the contents of which are all hereby incorporated by reference herein in their entirety.

BACKGROUND OF THE DISCLOSURE Field of the Disclosure

This disclosure relates to a wireless communication system.

Related Art

Sidelink (SL) communication is a communication scheme in which a direct link is established between User Equipments (UEs) and the UEs exchange voice and data directly with each other without intervention of an evolved Node B (eNB). SL communication is under consideration as a solution to the overhead of an eNB caused by rapidly increasing data traffic. Vehicle-to-everything (V2X) refers to a communication technology through which a vehicle exchanges information with another vehicle, a pedestrian, an object having an infrastructure (or infra) established therein, and so on. The V2X may be divided into 4 types, such as vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-network (V2N), and vehicle-to-pedestrian (V2P). The V2X communication may be provided via a PC5 interface and/or Uu interface.

Meanwhile, as a wider range of communication devices require larger communication capacities, the need for mobile broadband communication that is more enhanced than the existing Radio Access Technology (RAT) is rising. Accordingly, discussions are made on services and user equipment (UE) that are sensitive to reliability and latency. And, a next generation radio access technology that is based on the enhanced mobile broadband communication, massive Machine Type Communication (MTC), Ultra-Reliable and Low Latency Communication (URLLC), and so on, may be referred to as a new radio access technology (RAT) or new radio (NR). Herein, the NR may also support vehicle-to-everything (V2X) communication.

FIG. 1 is a drawing for describing V2X communication based on NR, compared to V2X communication based on RAT used before NR. The embodiment of FIG. 1 may be combined with vanous embodiments of the present disclosure.

Regarding V2X communication, a scheme of providing a safety service, based on a V2X message such as Basic Safety Message (BSM), Cooperative Awareness Message (CAM), and Decentralized Environmental Notification Message (DENM) is focused in the discussion on the RAT used before the NR. The V2X message may include position information, dynamic information, attribute information, or the like. For example, a UE may transmit a periodic message type CAM and/or an event triggered message type DENM to another UE.

Thereafter, regarding V2X communication, various V2X scenarios are proposed in NR. For example, the various V2X scenarios may include vehicle platooning, advanced driving, extended sensors, remote driving, or the like.

SUMMARY OF THE DISCLOSURE Technical Solutions

According to an embodiment of the present disclosure, a method for performing, by a first device, wireless communication may be proposed. For example, the method may comprise: obtaining information related to a resource pool; obtaining a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generating a medium access control (MAC) protocol data unit (PDU) related to a groupcast transmission; and selecting at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

According to an embodiment of the present disclosure, a first device for performing wireless communication may be proposed. For example, the first device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: obtain information related to a resource pool; obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generate a medium access control (MAC) protocol data unit (PDU) related to a groupcast transmission; and select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

According to an embodiment of the present disclosure, a device adapted to control a first user equipment (UE) may be proposed. For example, the device may comprise: one or more processors; and one or more memories operably connectable to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: obtain information related to a resource pool; obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generate a medium access control (MAC) protocol data unit (PDU) related to a groupcast transmission; and select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be proposed. For example, the instructions, when executed, may cause a first device to: obtain information related to a resource pool; obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generate a medium access control (MAC) protocol data unit (PDU) related to a groupcast transmission; and select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

According to an embodiment of the present disclosure, a method for performing, by a second device, wireless communication may be proposed. For example, the method may comprise: obtaining information related to a resource pool; obtaining a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; receiving first sidelink control information (SCI), from a first device, for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), based on a first SL resource, in a first SL DRX active time of the SL DRX configuration; receiving a medium access control (MAC) protocol data unit (PDU) related to groupcast transmission and second SCI, from the first device, through the PSSCH, based on the first SL resource, in the first SL DRX active time; and starting a timer related to a second SL DRX active time based on the first SCI and the second SCI, wherein the first SL resource is included in the first SL DRX active time, wherein at least one SL resource including the first SL resource is selected among a plurality of candidate resources in the resource pool based on sensing, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

According to an embodiment of the present disclosure, a second device for performing wireless communication may be proposed. For example, the second device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: obtain information related to a resource pool; obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; receive first sidelink control information (SCI), from a first device, for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), based on a first SL resource, in a first SL DRX active time of the SL DRX configuration: receive a medium access control (MAC) protocol data unit (PDU) related to groupcast transmission and second SCI, from the first device, through the PSSCH, based on the first SL resource, in the first SL DRX active time; and start a timer related to a second SL DRX active time based on the first SCI and the second SCI, wherein the first SL resource is included in the first SL DRX active time, wherein at least one SL resource including the first SL resource is selected among a plurality of candidate resources in the resource pool based on sensing, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

Effects of the Disclosure

The user equipment (UE) may efficiently perform SL communication.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a drawing for describing V2X communication based on NR, compared to V2X communication based on RAT used before NR.

FIG. 2 shows a structure of an NR system, based on an embodiment of the present disclosure.

FIG. 3 shows a radio protocol architecture, based on an embodiment of the present disclosure.

FIG. 4 shows a structure of a radio frame of an NR, based on an embodiment of the present disclosure.

FIG. 5 shows a structure of a slot of an NR frame, based on an embodiment of the present disclosure.

FIG. 6 shows an example of a BWP, based on an embodiment of the present disclosure.

FIG. 7 shows a UE performing V2X or SL communication, based on an embodiment of the present disclosure.

FIG. 8 shows a procedure of performing V2X or SL communication by a UE based on a transmission mode, based on an embodiment of the present disclosure.

FIG. 9 shows three cast types, based on an embodiment of the present disclosure.

FIG. 10 shows an example of a DRX cycle according to an embodiment of the present disclosure.

FIG. 11 shows a method in which a UE that has reserved transmission resource(s) informs another UE of the transmission resource(s), based on an embodiment of the present disclosure.

FIG. 12 shows an embodiment in which a transmitting UE selects a resource for groupcast communication, according to an embodiment of the present disclosure.

FIG. 13 shows a procedure for a transmitting UE to select a resource for groupcast communication according to an embodiment of the present disclosure.

FIG. 14 shows a procedure in which a first device performs wireless communication, according to an embodiment of the present disclosure.

FIG. 15 shows a procedure in which a second device performs wireless communication, according to an embodiment of the present disclosure.

FIG. 16 shows a communication system 1, based on an embodiment of the present disclosure.

FIG. 17 shows wireless devices, based on an embodiment of the present disclosure.

FIG. 18 shows a signal process circuit for a transmission signal, based on an embodiment of the present disclosure.

FIG. 19 shows another example of a wireless device, based on an embodiment of the present disclosure.

FIG. 20 shows a hand-held device, based on an embodiment of the present disclosure.

FIG. 21 shows a vehicle or an autonomous vehicle, based on an embodiment of the present disclosure.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

In the present specification, “A or B” may mean “only A”, “only B” or “both A and B.” In other words, in the present specification, “A or B” may be interpreted as “A and/or B”. For example, in the present specification, “A, B, or C” may mean “only A”, “only B”, “only C”, or “any combination of A, B, C”.

A slash (/) or comma used in the present specification may mean “and/or”. For example, “A/B” may mean “A and/or B”. Accordingly, “A/B” may mean “only A”, “only B”, or “both A and B”. For example, “A, B, C” may mean “A, B, or C”.

In the present specification, “at least one of A and B” may mean “only A”, “only B”, or “both A and B”. In addition, in the present specification, the expression “at least one of A or B” or “at least one of A and/or B” may be interpreted as “at least one of A and B”.

In addition, in the present specification, “at least one of A. B, and C” may mean “only A”, “only B”, “only C”, or “any combination of A, B, and C”. In addition, “at least one of A, B, or C” or “at least one of A, B, and/or C” may mean “at least one of A, B, and C”.

In addition, a parenthesis used in the present specification may mean “for example”. Specifically, when indicated as “control information (PDCCH)”, it may mean that “PDCCH” is proposed as an example of the “control information”. In other words, the “control information” of the present specification is not limited to “PDCCH”, and “PDCCH” may be proposed as an example of the “control information”. In addition, when indicated as “control information (i.e., PDCCH)”, it may also mean that “PDCCH” is proposed as an example of the “control information”.

A technical feature described individually in one figure in the present specification may be individually implemented, or may be simultaneously implemented.

The technology described below may be used in various wireless communication systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and so on. The CDMA may be implemented with a radio technology, such as universal terrestrial radio access (UTRA) or CDMA-2000. The TDMA may be implemented with a radio technology, such as global system for mobile communications (GSM)/general packet ratio service (GPRS)/enhanced data rate for GSM evolution (EDGE). The OFDMA may be implemented with a radio technology, such as institute of electrical and electronics engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, evolved UTRA (E-UTRA), and so on. IEEE 802.16m is an evolved version of IEEE 802.16e and provides backward compatibility with a system based on the IEEE 802.16e. The UTRA is part of a universal mobile telecommunication system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is part of an evolved UMTS (E-UMTS) using the E-UTRA. The 3GPP LTE uses the OFDMA in a downlink and uses the SC-FDMA in an uplink. LTE-advanced (LTE-A) is an evolution of the LTE.

5G NR is a successive technology of LTE-A corresponding to a new Clean-slate type mobile communication system having the characteristics of high performance, low latency, high availability, and so on. 5G NR may use resources of all spectrum available for usage including low frequency bands of less than 1 GHz, middle frequency bands ranging from 1 GHz to 10 GHz, high frequency (millimeter waves) of 24 GHz or more, and so on.

For clarity in the description, the following description will mostly focus on LTE-A or 5G NR. However, technical features according to an embodiment of the present disclosure will not be limited only to this.

FIG. 2 shows a structure of an NR system, based on an embodiment of the present disclosure. The embodiment of FIG. 2 may be combined with various embodiments of the present disclosure.

Referring to FIG. 2 , a next generation-radio access network (NG-RAN) may include a BS 20 providing a UE 10 with a user plane and control plane protocol termination. For example, the BS 20 may include a next generation-Node B (gNB) and/or an evolved-NodeB (eNB). For example, the UE 10 may be fixed or mobile and may be referred to as other terms, such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), wireless device, and so on. For example, the BS may be referred to as a fixed station which communicates with the UE 10 and may be referred to as other terms, such as a base transceiver system (BTS), an access point (AP), and so on.

The embodiment of FIG. 2 exemplifies a case where only the gNB is included. The BSs 20 may be connected to one another via Xn interface. The BS 20 may be connected to one another via 5th generation (5G) core network (5GC) and NG interface. More specifically, the BSs 20 may be connected to an access and mobility management function (AMF) 30 via NG-C interface, and may be connected to a user plane function (UPF) 30 via NG-U interface.

Layers of a radio interface protocol between the UE and the network can be classified into a first layer (layer 1, L1), a second layer (layer 2, L2), and a third layer (layer 3. L3) based on the lower three layers of the open system interconnection (OSI) model that is well-known in the communication system. Among them, a physical (PHY) layer belonging to the first layer provides an information transfer service by using a physical channel, and a radio resource control (RRC) layer belonging to the third layer serves to control a radio resource between the UE and the network. For this, the RRC layer exchanges an RRC message between the UE and the BS.

FIG. 3 shows a radio protocol architecture, based on an embodiment of the present disclosure. The embodiment of FIG. 3 may be combined with various embodiments of the present disclosure. Specifically, (a) of FIG. 3 shows a radio protocol stack of a user plane for Uu communication, and (b) of FIG. 3 shows a radio protocol stack of a control plane for Uu communication, (c) of FIG. 3 shows a radio protocol stack of a user plane for SL communication, and (d) of FIG. 3 shows a radio protocol stack of a control plane for SL communication.

Referring to FIG. 3 , a physical layer provides an upper layer with an information transfer service through a physical channel. The physical layer is connected to a medium access control (MAC) layer which is an upper layer of the physical layer through a transport channel. Data is transferred between the MAC layer and the physical layer through the transport channel. The transport channel is classified according to how and with what characteristics data is transmitted through a radio interface.

Between different physical layers, i.e., a physical layer of a transmitter and a physical layer of a receiver, data are transferred through the physical channel. The physical channel is modulated using an orthogonal frequency division multiplexing (OFDM) scheme, and utilizes time and frequency as a radio resource.

The MAC layer provides services to a radio link control (RLC) layer, which is a higher layer of the MAC layer, via a logical channel. The MAC layer provides a function of mapping multiple logical channels to multiple transport channels. The MAC layer also provides a function of logical channel multiplexing by mapping multiple logical channels to a single transport channel. The MAC layer provides data transfer services over logical channels.

The RLC layer performs concatenation, segmentation, and reassembly of Radio Link Control Service Data Unit (RLC SDU). In order to ensure diverse quality of service (QoS) required by a radio bearer (RB), the RLC layer provides three types of operation modes, i.e., a transparent mode (TM), an unacknowledged mode (UM), and an acknowledged mode (AM). An AM RLC provides error correction through an automatic repeat request (ARQ).

A radio resource control (RRC) layer is defined only in the control plane. The RRC layer serves to control the logical channel, the transport channel, and the physical channel in association with configuration, reconfiguration and release of RBs. The RB is a logical path provided by the first layer (i.e., the physical layer or the PHY layer) and the second layer (i.e., a MAC layer, an RLC layer, a packet data convergence protocol (PDCP) layer, and a service data adaptation protocol (SDAP) layer) for data delivery between the UE and the network.

Functions of a packet data convergence protocol (PDCP) layer in the user plane include user data delivery, header compression, and ciphering. Functions of a PDCP layer in the control plane include control-plane data delivery and ciphering/integrity protection.

A service data adaptation protocol (SDAP) layer is defined only in a user plane. The SDAP layer performs mapping between a Quality of Service (QoS) flow and a data radio bearer (DRB) and QoS flow ID (QFI) marking in both DL and UL packets.

The configuration of the RB implies a process for specifying a radio protocol layer and channel properties to provide a particular service and for determining respective detailed parameters and operations. The RB can be classified into two types, i.e., a signaling RB (SRB) and a data RB (DRB). The SRB is used as a path for transmitting an RRC message in the control plane. The DRB is used as a path for transmitting user data in the user plane.

When an RRC connection is established between an RRC layer of the UE and an RRC layer of the E-UTRAN, the UE is in an RRC_CONNECTED state, and, otherwise, the UE may be in an RRC_IDLE state. In case of the NR, an RRC_INACTIVE state is additionally defined, and a UE being in the RRC_INACTIVE state may maintain its connection with a core network whereas its connection with the BS is released.

Data is transmitted from the network to the UE through a downlink transport channel. Examples of the downlink transport channel include a broadcast channel (BCH) for transmitting system information and a downlink-shared channel (SCH) for transmitting user traffic or control messages. Traffic of downlink multicast or broadcast services or the control messages can be transmitted on the downlink-SCH or an additional downlink multicast channel (MCH). Data is transmitted from the UE to the network through an uplink transport channel. Examples of the uplink transport channel include a random access channel (RACH) for transmitting an initial control message and an uplink SCH for transmitting user traffic or control messages.

Examples of logical channels belonging to a higher channel of the transport channel and mapped onto the transport channels include a broadcast channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), a multicast traffic channel (MTCH), etc.

FIG. 4 shows a structure of a radio frame of an NR, based on an embodiment of the present disclosure. The embodiment of FIG. 4 may be combined with various embodiments of the present disclosure.

Referring to FIG. 4 , in the NR, a radio frame may be used for performing uplink and downlink transmission. A radio frame has a length of 10 ms and may be defined to be configured of two half-frames (HFs). A half-frame may include five 1 ms subframes (SFs). A subframe (SF) may be divided into one or more slots, and the number of slots within a subframe may be determined based on subcarrier spacing (SCS). Each slot may include 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP).

In case of using a normal CP, each slot may include 14 symbols. In case of using an extended CP, each slot may include 12 symbols. Herein, a symbol may include an OFDM symbol (or CP-OFDM symbol) and a Single Camer-FDMA (SC-FDMA) symbol (or Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) symbol).

Table 1 shown below represents an example of a number of symbols per slot (N^(slot) _(symb)), a number slots per frame (N^(frame,u) _(slot)), and a number of slots per subframe (N^(subframe,u) _(slot)) based on an SCS configuration (u), in a case where a normal CP is used.

TABLE 1 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot) N^(subframe, u) _(slot) 15 KHz (u = 0) 14 10 1 30 KHz (u = 1) 14 20 2 60 KHz (u = 2) 14 40 4 120 KHz (u = 3) 14 80 8 240 KHz (u = 4) 14 160 16

Table 2 shows an example of a number of symbols per slot, a number of slots per frame, and a number of slots per subframe based on the SCS, in a case where an extended CP is used.

TABLE 2 SCS (15*2^(u)) N^(slot) _(symb) N^(frame, u) _(slot) N^(subframe, u) _(slot) 60 KHz (u = 2) 12 40 4

In an NR system, OFDM(A) numerologies (e.g., SCS, CP length, and so on) between multiple cells being integrate to one UE may be differently configured. Accordingly, a (absolute time) duration (or section) of a time resource (e.g., subframe, slot or TTI) (collectively referred to as a time unit (TU) for simplicity) being configured of the same number of symbols may be differently configured in the integrated cells.

In the NR, multiple numerologies or SCSs for supporting diverse 5G services may be supported. For example, in case an SCS is 15 kHz, a wide area of the conventional cellular bands may be supported, and, in case an SCS is 30 kHz/60 kHz a dense-urban, lower latency, wider carrier bandwidth may be supported. In case the SCS is 60 kHz or higher, a bandwidth that is greater than 24.25 GHz may be used in order to overcome phase noise.

An NR frequency band may be defined as two different types of frequency ranges. The two different types of frequency ranges may be FR1 and FR2. The values of the frequency ranges may be changed (or varied), and, for example, the two different types of frequency ranges may be as shown below in Table 3. Among the frequency ranges that are used in an NR system. FR1 may mean a “sub 6 GHz range”, and FR2 may mean an “above 6 GHz range” and may also be referred to as a millimeter wave (mmW).

TABLE 3 Frequency Range Corresponding Subcarrier Spacing designation frequency range (SCS) FR1  450 MHz-6000 MHz  15, 30, 60 kHz FR2 24250 MHz-52600 MHz 60, 120, 240 kHz

As described above, the values of the frequency ranges in the NR system may be changed (or varied). For example, as shown below in Table 4, FR1 may include a band within a range of 410 MHz to 7125 MHz. More specifically, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, and so on) and higher. For example, a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, and so on) and higher being included in FR1 mat include an unlicensed band. The unlicensed band may be used for diverse purposes, e.g., the unlicensed band for vehicle-specific communication (e.g., automated driving).

TABLE 4 Frequency Range Corresponding Subcarrier Spacing designation frequency range (SCS) FR1  410 MHz-7125 MHz  15, 30, 60 kHz FR2 24250 MHz-52600 MHz 60, 120, 240 kHz

FIG. 5 shows a structure of a slot of an NR frame, based on an embodiment of the present disclosure. The embodiment of FIG. 5 may be combined with various embodiments of the present disclosure.

Referring to FIG. 5 , a slot includes a plurality of symbols in a time domain. For example, in case of a normal CP, one slot may include 14 symbols. However, in case of an extended CP, one slot may include 12 symbols. Alternatively, in case of a normal CP, one slot may include 7 symbols. However, in case of an extended CP, one slot may include 6 symbols.

A carrier includes a plurality of subcarriers in a frequency domain. A Resource Block (RB) may be defined as a plurality of consecutive subcarriers (e.g., 12 subcarriers) in the frequency domain. A Bandwidth Part (BWP) may be defined as a plurality of consecutive (Physical) Resource Blocks ((P)RBs) in the frequency domain, and the BWP may correspond to one numerology (e.g., SCS, CP length, and so on). A carrier may include a maximum of N number BWPs (e.g., 5 BWPs). Data communication may be performed via an activated BWP. Each element may be referred to as a Resource Element (RE) within a resource grid and one complex symbol may be mapped to each element.

Hereinafter, a bandwidth part (BWP) and a carrier will be described.

The BWP may be a set of consecutive physical resource blocks (PRBs) in a given numerology. The PRB may be selected from consecutive sub-sets of common resource blocks (CRBs) for the given numerology on a given carrier

For example, the BWP may be at least any one of an active BWP, an initial BWP, and/or a default BWP. For example, the UE may not monitor downlink radio link quality in a DL BWP other than an active DL BWP on a primary cell (PCell). For example, the UE may not receive PDCCH, physical downlink shared channel (PDSCH), or channel state information—reference signal (CSI-RS) (excluding RRM) outside the active DL BWP. For example, the UE may not trigger a channel state information (CSI) report for the inactive DL BWP. For example, the UE may not transmit physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) outside an active UL BWP. For example, in a downlink case, the initial BWP may be given as a consecutive RB set for a remaining minimum system information (RMSI) control resource set (CORESET) (configured by physical broadcast channel (PBCH)). For example, in an uplink case, the initial BWP may be given by system information block (SIB) for a random access procedure. For example, the default BWP may be configured by a higher layer. For example, an initial value of the default BWP may be an initial DL BWP. For energy saving, if the UE fails to detect downlink control information (DCI) during a specific period, the UE may switch the active BWP of the UE to the default BWP.

Meanwhile, the BWP may be defined for SL. The same SL BWP may be used in transmission and reception. For example, a transmitting UE may transmit an SL channel or an SL signal on a specific BWP, and a receiving UE may receive the SL channel or the SL signal on the specific BWP. In a licensed carrier, the SL BWP may be defined separately from a Uu BWP, and the SL BWP may have configuration signaling separate from the Uu BWP. For example, the UE may receive a configuration for the SL BWP from the BS/network. For example, the UE may receive a configuration for the Uu BWP from the BS/network. The SL BWP may be (pre-)configured in a carrier with respect to an out-of-coverage NR V2X UE and an RRC_IDLE UE. For the UE in the RRC_CONNECTED mode, at least one SL BWP may be activated in the carrier.

FIG. 6 shows an example of a BWP, based on an embodiment of the present disclosure. The embodiment of FIG. 6 may be combined with various embodiments of the present disclosure. It is assumed in the embodiment of FIG. 6 that the number of BWPs is 3.

Referring to FIG. 6 , a common resource block (CRB) may be a carrier resource block numbered from one end of a carrier band to the other end thereof. In addition, the PRB may be a resource block numbered within each BWP. A point A may indicate a common reference point for a resource block grid.

The BWP may be configured by a point A, an offset N^(start) _(BWP) from the point A, and a bandwidth N^(size) _(BWP). For example, the point A may be an external reference point of a PRB of a carrier in which a subcarrier 0 of all numerologies (e.g., all numerologies supported by a network on that carrier) is aligned. For example, the offset may be a PRB interval between a lowest subcarrier and the point A in a given numerology. For example, the bandwidth may be the number of PRBs in the given numerology.

Hereinafter, V2X or SL communication will be described.

A sidelink synchronization signal (SLSS) may include a primary sidelink synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS), as an SL-specific sequence. The PSSS may be referred to as a sidelink primary synchronization signal (S-PSS), and the SSSS may be referred to as a sidelink secondary synchronization signal (S-SSS). For example, length-127 M-sequences may be used for the S-PSS, and length-127 gold sequences may be used for the S-SSS. For example, a UE may use the S-PSS for initial signal detection and for synchronization acquisition. For example, the UE may use the S-PSS and the S-SSS for acquisition of detailed synchronization and for detection of a synchronization signal ID.

A physical sidelink broadcast channel (PSBCH) may be a (broadcast) channel for transmitting default (system) information which must be first known by the UE before SL signal transmission/reception. For example, the default information may be information related to SLSS, a duplex mode (DM), a time division duplex (TDD) uplink/downlink (UL/DL) configuration, information related to a resource pool, a type of an application related to the SLSS, a subframe offset, broadcast information, or the like. For example, for evaluation of PSBCH performance, in NR V2X, a payload size of the PSBCH may be 56 bits including 24-bit cyclic redundancy check (CRC).

The S-PSS, the S-SSS, and the PSBCH may be included in a block format (e.g., SL synchronization signal (SS)/PSBCH block, hereinafter, sidelink-synchronization signal block (S-SSB)) supporting periodical transmission. The S-SSB may have the same numerology (i.e., SCS and CP length) as a physical sidelink control channel (PSCCH)/physical sidelink shared channel (PSSCH) in a carrier, and a transmission bandwidth may exist within a (pre-)configured sidelink (SL) BWP. For example, the S-SSB may have a bandwidth of 11 resource blocks (RBs). For example, the PSBCH may exist across 11 RBs. In addition, a frequency position of the S-SSB may be (pre-)configured. Accordingly, the UE does not have to perform hypothesis detection at frequency to discover the S-SSB in the carrier.

FIG. 7 shows a UE performing V2X or SL communication, based on an embodiment of the present disclosure. The embodiment of FIG. 7 may be combined with various embodiments of the present disclosure.

Referring to FIG. 7 , in V2X or SL communication, the term ‘UE’ may generally imply a UE of a user. However, if a network equipment such as a BS transmits/receives a signal according to a communication scheme between UEs, the BS may also be regarded as a sort of the UE. For example, a UE 1 may be a first apparatus 100, and a UE 2 may be a second apparatus 200.

For example, the UE 1 may select a resource unit corresponding to a specific resource in a resource pool which implies a set of series of resources. In addition, the UE 1 may transmit an SL signal by using the resource unit. For example, a resource pool in which the UE 1 is capable of transmitting a signal may be configured to the UE 2 which is a receiving UE, and the signal of the UE 1 may be detected in the resource pool.

Herein, if the UE 1 is within a connectivity range of the BS, the BS may inform the UE 1 of the resource pool. Otherwise, if the UE 1 is out of the connectivity range of the BS, another UE may inform the UE 1 of the resource pool, or the UE 1 may use a pre-configured resource pool.

In general, the resource pool may be configured in unit of a plurality of resources, and each UE may select a unit of one or a plurality of resources to use it in SL signal transmission thereof.

Hereinafter, resource allocation in SL will be described.

FIG. 8 shows a procedure of performing V2X or SL communication by a UE based on a transmission mode, based on an embodiment of the present disclosure. The embodiment of FIG. 8 may be combined with various embodiments of the present disclosure. In various embodiments of the present disclosure, the transmission mode may be called a mode or a resource allocation mode. Hereinafter, for convenience of explanation, in LTE, the transmission mode may be called an LTE transmission mode. In NR, the transmission mode may be called an NR resource allocation mode.

For example, (a) of FIG. 8 shows a UE operation related to an LTE transmission mode 1 or an LTE transmission mode 3. Alternatively, for example, (a) of FIG. 8 shows a UE operation related to an NR resource allocation mode 1. For example, the LTE transmission mode 1 may be applied to general SL communication, and the LTE transmission mode 3 may be applied to V2X communication.

For example, (b) of FIG. 8 shows a UE operation related to an LTE transmission mode 2 or an LTE transmission mode 4. Alternatively, for example, (b) of FIG. 8 shows a UE operation related to an NR resource allocation mode 2.

Referring to (a) of FIG. 8 , in the LTE transmission mode 1, the LTE transmission mode 3, or the NR resource allocation mode 1, a BS may schedule an SL resource to be used by the UE for SL transmission. For example, the BS may perform resource scheduling to a UE 1 through a PDCCH (e.g., downlink control information (DCI)) or RRC signaling (e.g., Configured Grant Type 1 or Configured Grant Type 2), and the UE 1 may perform V2X or SL communication with respect to a UE 2 according to the resource scheduling. For example, the UE 1 may transmit a sidelink control information (SCI) to the UE 2 through a physical sidelink control channel (PSCCH), and thereafter transmit data based on the SCI to the UE 2 through a physical sidelink shared channel (PSSCH).

Referring to (b) of FIG. 8 , in the LTE transmission mode 2, the LTE transmission mode 4, or the NR resource allocation mode 2, the UE may determine an SL transmission resource within an SL resource configured by a BS/network or a pre-configured SL resource. For example, the configured SL resource or the pre-configured SL resource may be a resource pool. For example, the UE may autonomously select or schedule a resource for SL transmission. For example, the UE may perform SL communication by autonomously selecting a resource within a configured resource pool. For example, the UE may autonomously select a resource within a selective window by performing a sensing and resource (re)selection procedure. For example, the sensing may be performed in unit of subchannels. In addition, the UE 1 which has autonomously selected the resource within the resource pool may transmit the SCI to the UE 2 through a PSCCH, and thereafter may transmit data based on the SCI to the UE 2 through a PSSCH.

FIG. 9 shows three cast types, based on an embodiment of the present disclosure. The embodiment of FIG. 9 may be combined with various embodiments of the present disclosure. Specifically, (a) of FIG. 9 shows broadcast-type SL communication, (b) of FIG. 9 shows unicast type-SL communication, and (c) of FIG. 9 shows groupcast-type SL communication. In case of the unicast-type SL communication, a UE may perform one-to-one communication with respect to another UE. In case of the groupcast-type SL transmission, the UE may perform SL communication with respect to one or more UEs in a group to which the UE belongs. In various embodiments of the present disclosure, SL groupcast communication may be replaced with SL multicast communication, SL one-to-many communication, or the like.

Hereinafter, power saving will be described.

As a power saving technique of at UE, UE adaptation to traffic and power consumption characteristics, adaptation according to frequency/time change, adaptation to antenna, adaptation to discontinuous reception (DRX) setting, adaptation to UE processing capability, adaptation for reduction of PDCCH monitoring/decoding, power saving signal/channel/procedure for triggering adaptation to UE power consumption, power consumption reduction in RRM measurement, etc. may be considered.

Hereinafter, discontinuous reception (DRX), which is one of techniques capable of realizing UE power saving, will be described.

The procedure of a DRX-related UE can be summarized as shown in Table 5 below.

TABLE 5 Type of signals UE procedure Step 1 RRC signalling receive DRX configuration (MAC-CellGroupConfig) information Step 2 MAC CE((Long) DRX receive DRX command command MAC CE) Step 3 monitor a PDCCH during an on-duration of DRX period

FIG. 10 shows an example of a DRX cycle according to an embodiment of the present disclosure. The embodiment of FIG. 10 may be combined with various embodiments of the present disclosure.

Referring to FIG. 10 , a UE uses DRX in RRC_IDLE state and RRC_INACTIVE state to reduce power consumption. When DRX is configured, a UE performs DRX operation according to DRX configuration information. A UE operating as DRX repeatedly turns on and off the reception task.

For example, when DRX is configured, a UE attempts to receive a downlink channel PDCCH only within a pre-configured time interval, and does not attempt to receive the PDCCH within the remaining time interval. The time period during which a UE should attempt to receive a PDCCH is called on-duration, and the on-duration period is defined once per DRX cycle.

A UE may receive DRX configuration information from a gNB through RRC signaling, and may operate as DRX through reception of a (long) DRX command MAC CE.

DRX configuration information may be included in MAC-CellGroupConfig. The IE, MAC-CellGroupConfig, may be used to configure MAC parameters for a cell group, including DRX.

A DRX command MAC CE or long DRX command MAC CE is identified by a MAC PDU subheader with a logical channel ID (LCID). It has a fixed size of 0 bits.

Table 6 below shows a value of LCID for DL-SCH.

TABLE 6 Index LCID values 111011 Long DRX Command 111100 DRX Command

The PDCCH monitoring operation of a UE is controlled by DRX and Bandwidth Adaptation (BA). On the other hand, when DRX is configured, a UE does not need to continuously monitor a PDCCH. On the other hand, DRX has the following characteristics.

-   -   on-duration: This is a period in which a UE waits to receive the         next PDCCH after waking up. If a UE successfully decodes a         PDCCH, the UE maintains the awake state and starts an         inactivity-timer.     -   an inactive timer: This is a time interval in which a UE waits         for successful PDCCH decoding from the last successful PDCCH         decoding, and it is a period in which the UE sleeps again in         case of failure. A UE must restart an inactivity timer after a         single successful decoding of a PDCCH for the only first         transmission (i.e., not for retransmission).     -   a retransmission timer: A time interval during which a         retransmission is expected.     -   a cycle: It defines the periodic repetition of on-duration and         subsequent possible periods of inactivity.

Hereinafter, DRX in a MAC laver will be described. Hereinafter, a MAC entity may be expressed as a UE or a MAC entity of a UE.

A MAC entity may be configured by RRC with DRX function for controlling a PDCCH monitoring activity of a UE for a radio network temporary identifier (C-RNTI), CS-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, and TPC-SRS-RNTI of the MAC entity. When using DRX operation, a MAC entity must monitor a PDCCH. In the RRC_CONNECTED state, if DRX is configured, a MAC entity may monitor a PDCCH discontinuously using a DRX operation. Otherwise, a MAC entity must continuously monitor a PDCCH.

RRC controls DRX operation by setting parameters of DRX configuration information.

If a DRX cycle is set, an active time includes the following time.

-   -   a running time of drx-onDurationTimer or drx-InactivityTimer or         drx-RetransmissionTimerDL or drx-RetransmissionDimerUL or         ra-ContentionResolutionTimer; or         -   a time a scheduling request was transmitted on a PUCCH and             is pending; or     -   a time when a PDCCH indicating new transmission to a C-RNTI of a         MAC entity is not received after successful reception of a         random access response to a random access preamble not selected         by the MAC entity among contention-based random access         preambles.

When DRX is configured, a UE must follow a procedure below.

1> if a MAC PDU is transmitted in a configured uplink grant

2> start the drx-HARQ-RTT-TimerUL for the corresponding HARQ process after the first reception of the corresponding PUSCH transmission;

2> stop the drx-RetransmissionTimerUL for the corresponding HARQ process.

1> if a drx-HARQ-RTT-TimerDL expires:

2> if the data of the corresponding HARQ process was not successfully decoded:

3> start the drx-RetransmissionTimerDL for the corresponding HARQ process.

1> if a drx-HARQ-RTT-TimerUL expires:

2> start the drx-RetransmissionTimerUL for the corresponding HARQ process.

1> if a DRX Command MAC CE or a Long DRX Command MAC CE is received:

2> stop drx-onDurationTimer;

2> stop drx-InactivityTimer.

1> if drx-InactivityTimer expires or a DRX Command MAC CE is received:

2> if the Short DRX cycle is configured:

3> start of restart drx-ShortCycleTimer;

3> use the Short DRX Cycle.

2> else:

3> use the Long DRX cycle.

1> if drx-ShortCycleTimer expires:

2> use the Long DRX cycle.

1> if a Long DRX Command MAC CE is received:

2> stop drx-ShortCycleTimer;

2> use the Long DRX cycle.

1> if the Short DRX Cycle is used, and [(SFN×10)+subframe number] modulo (drx-ShortCycle)=(drx-StartOffset) modulo (drx-ShortCycle); or

1> if the Long DRX Cycle is used, and [(SFN×10)+subframe number] modulo (drx-LongCycle)=drx-StartOffset:

2> if drx-SlotOffset is configured:

3> start drx-onDurationTimer after drx-SlotOffset.

2> else:

3> start drx-onDurationTimer.

1> if the MAC entity is in Active Time:

2> monitor the PDCCH:

2> if the PDCCH indicates a DL transmission or if a DL allocation is configured:

3> start the drx-HARQ-RTT-TimerDL for the corresponding HARQ process after the end of the corresponding PUCCH transmission;

3> stop the drx-RetransmissionTimerDL for the corresponding HARQ process.

2> if the PDCCH indicates a UL transmission:

3> start the drx-HARQ-RTT-TimerUL for the corresponding HARQ process after the end of the first reception of the corresponding PUSCH transmission;

3> stop drx-Retransmission Timer UL for the corresponding HARQ process.

2> if the PDCCH indicates a new transmission (DL or UL):

3> start or restart drx-InactivityTimer.

1> else (That is, when it is not a part of the active time):

2> not transmit type-0-triggered SRS.

1> if CSI masking (csi-Mask) is setup by upper layers:

2> if drx-onDurationTimer is not running:

3> not report CSI on PUCCH.

1> else:

2> if the MAC entity is not in the active time:

3> not report CSI on PUCCH.

Regardless of whether the MAC entity monitors the PDCCH or not, the MAC entity sends HARQ feedback and type-1-triggered SRS when expected.

If it is not a complete PDCCH time point (i.e., if the active time starts or expires in the middle of the PDCCH time point), the MAC entity does not need to monitor a PDCCH.

In the present disclosure, the wording “configuration of definition” may be interpreted as being (pre-) configured from a base station or a network (via predefined signaling (e.g., SIB, MAC signaling, RRC signaling)). For example, “A may be configured” may include “that a base station or network (pre-) configures/defines or informs A for a UE”. Alternatively, the wording “configuration or definition” may be interpreted as being configured or defined in advance by a system. For example, “A may be configured” may include “A is configured/defined in advance by a system”.

Meanwhile, in various embodiments of the present disclosure, a transmitting UE (i.e., TX UE) may be a UE which transmits data to (target) receiving UE(s) (i.e., RX UE(s)). For example, the TX UE may be a UE which performs PSCCH transmission and/or PSSCH transmission. For example, the TX UE may be a UE which transmits SL CSI-RS(s) and/or a SL CSI report request indication to (target) RX UE(s). For example, the TX UE may be a UE which transmits a (pre-defined) reference signal(s)(e.g., PSSCH demodulation reference signal (DM-RS)) and/or SL (L1) RSRP report request indicator, which is/are used for SL (L1) RSRP measurement, to (target) to RX UE(s). For example, the TX UE may be a UE which transmits a (control) channel (e.g., PSCCH, PSSCH, etc.) and/or reference signal(s) (e.g., DM-RS(s), CSI-RS(s), etc.) through the (control) channel, which is/are used for SL radio link monitoring (RLM) operation(s) and/or SL radio link failure (RLF) operation(s) of (target) RX UE(s).

Meanwhile, in various embodiments of the present disclosure, a receiving UE (i.e., RX UE) may be a UE which transmits SL HARQ feedback to transmitting UE(s) (i.e., TX UE(s)), based on whether or not data transmitted by TX UE(s) is decoded successfully and/or whether or not a PSCCH (related to PSSCH scheduling) transmitted by TX UE(s) is detected/decoded successfully. For example, the RX UE may be a UE which performs SL CSI transmission to TX UE(s) based on SL CSI-RS(s) and/or a SL CSI report request indication received from TX UE(s). For example, the RX UE may be a UE which transmits, to TX UE(s), an SL (L1) RSRP measurement value measured based on (pre-defined) reference signal(s) and/or SL (L1) RSRP report request indication received from TX UE(s). For example, the RX UE may be a UE which transmits its own data to TX UE(s). For example, the RX UE may be a UE which performs SL RLM operation(s) and/or SL RLF operation(s) based on a (pre-configured) (control) channel and/or reference signal(s) through the (control) channel received from TX UE(s).

Meanwhile, in various embodiments of the present disclosure, when a receiving UE transmits SL HARQ feedback information for a PSSCH and/or a PSCCH received from a transmitting UE, the following method may be considered or partly considered. Here, for example, the corresponding scheme or some schemes may be limitedly applied only when a receiving UE successfully decodes/detects a PSCCH for scheduling a PSSCH.

-   -   Option 1: transmit NACK information only when PSSCH         decoding/reception fails     -   Option 2: transmit ACK information when PSSCH decoding/reception         is successful, or transmit NACK information when fails

Meanwhile, in the present specification, for example, a transmitting UE may transmit at least one of the following information to the receiving UE through SCI. Here, for example, a transmitting UE may transmit at least one of the following information to a receiving UE through first SCI and/or a second SCI.

-   -   PSSCH and/or PSCCH related resource allocation information,         e.g., the number/positions of time/frequency resources, resource         reservation information (e.g., period), and/or     -   SL CSI report request indicator or SL (L1) RSRP (and/or SL (L1)         RSRQ and/or SL (L1) RSSI) report request indicator, and/or     -   SL CSI transmission indicator (or SL (L1) RSRP (and/or SL (L1)         RSRQ and/or SL (L1) RSSI) information transmission indicator))         (on PSSCH), and/or     -   MCS information, and/or     -   Transmit power information, and/or     -   L1 destination ID information and/or L1 source ID information,         and/or     -   SL HARQ process ID information, and/or     -   New data indicator (NDI) information, and/or     -   Redundancy version (RV) information, and/or     -   (Transmission traffic/packet related) QoS information. e.g.,         priority information, and/or     -   SL CSI-RS transmission indicator or information on the number of         (to-be-transmitted) SL CSI-RS antenna ports, and/or     -   Location information of a transmitting UE or location (or         distance region) information of a target receiving UE (for which         SL HARQ feedback is requested), and/or     -   Reference signal (e.g., DMRS, etc.) related to channel         estimation and/or decoding of data to be transmitted through a         PSSCH, e.g., information related to a pattern of a         (time-frequency) mapping resource of DMRS, rank information,         antenna port index information

Meanwhile, in various embodiments of the present disclosure, for example, a PSCCH may be replaced/substituted with at least one of a SCI, a first SCI (1^(st)-stage SCI), and/or a second SCI (2^(nd)-stage SCI), or vice versa. For example, a SCI may be replaced/substituted with at least one of a PSCCH, a first SCI, and/or a second SCI, or vice versa. For example, a PSSCH may be replaced/substituted with a second SCI and/or a PSCCH, or vice versa

for example, if SCI configuration fields are divided into two groups in consideration of a (relatively) high SCI payload size, an SCI including a first SCI configuration field group may be referred to as a first SCI or a 1^(st) SCI, and an SCI including a second SCI configuration field group may be referred to as a second SCI or a 2^(nd) SCI. For example, the 1^(st) SCI and the 2^(nd) SCI may be transmitted through different channels. For example, the transmitting UE may transmit the first SCI to the receiving UE through the PSCCH. For example, the second SCI may be transmitted to the receiving UE through an (independent) PSCCH, or may be transmitted in a piggyback manner together with data through the PSSCH.

Meanwhile, in this specification, for example, “configuration” or “definition” may mean (pre)configuration from a base station or a network. For example, “configuration” or “define” may mean resource pool specific (pre)configuration from a base station or network. For example, a base station or a network may transmit information related to “configuration” or “definition” to a UE. For example, a base station or a network may transmit information related to “configuration” or “definition” to a UE through predefined signaling. For example, signaling to be pre-defined may include at least one of RRC signaling, MAC signaling, PHY signaling, and/or SIB.

Meanwhile, in this specification, for example, “configuration” or “definition” may mean designated or configured through signaling previously configured between UEs. For example, information related to “configuration” or “definition” may be transmitted/received through pre-configured signaling between UEs. For example, signaling to be pre-defined may be PC5 RRC signaling.

Meanwhile, in various embodiments of the present disclosure, for example, “RLF” may be interpreted as mutually extended to at least one of out of synch (OOS) and in synch (IS).

Meanwhile, in various embodiments of the present disclosure, for example, a resource block (RB) may be replaced/substituted with a subcarrier, or vice versa. For example, a packet or a traffic may be replaced/substituted with a transport block (TB) or a medium access control protocol data unit (MAC PDU) according to a transmission layer, or vice versa. For example, a code block group (CBG) may be replaced/substituted with a TB, or vice versa. For example, a source ID may be replaced/substituted with a destination ID, or vice versa. For example, an L1 ID may be replaced/substituted with an L2 ID, or vice versa. For example, the L1 ID may be an L1 source ID or an L1 destination ID. For example, the L2 ID may be an L2 source ID or an L2 destination ID.

Meanwhile, in various embodiments of the present disclosure, for example, operation(s) of a TX UE to reserve/select/determine retransmission resource(s) may include operation(s) of the TX UE to reserve/select/determine potential retransmission resource(s) in which actual use is determined based on SL HARQ feedback information received from RX UE(s).

Meanwhile, in various embodiments of the present disclosure, a sub-selection window may be replaced/substituted with a selection window and/or a pre-configured number of resource sets within the selection window, or vice versa.

Meanwhile, in various embodiments of the present disclosure, SL MODE 1 may refer to a resource allocation method or a communication method in which a base station directly schedules SL transmission resource(s) for a TX UE through pre-defined signaling (e.g., DCI or RRC message). For example, SL MODE 2 may refer to a resource allocation method or a communication method in which a UE independently selects SL transmission resource(s) in a resource pool pre-configured or configured from a base station or a network. For example, a UE performing SL communication based on SL MODE 1 may be referred to as a MODE 1 UE or MODE 1 TX UE, and a UE performing SL communication based on SL MODE 2 may be referred to as a MODE 2 UE or MODE 2 TX UE.

Meanwhile, in the present specification, for example, a dynamic grant (DG) may be replaced/substituted with a configured grant (CG) and/or a semi-persistent scheduling grant (SPS). For example, a DG may be replaced/substituted with a combination of a CG and a SPS grant. For example, a CG may include at least one of CG type 1 (configured grant type 1) and/or CG type 2 (configured grant type 2). For example, in CG type 1, a grant may be provided by RRC signaling and may be stored as a configured grant. For example, in CG type 2, a grant may be provided by a PDCCH, and may be stored or deleted as a grant configured based on L1 signaling indicating activation or deactivation of the grant. For example, in CG type 1, a base station may allocate a periodic resource to a transmitting UE through an RRC message. For example, in CG type 2, a base station may allocate a periodic resource to a transmitting UE through an RRC message, the base station may dynamically activate or deactivate the periodic resource through DCI.

Meanwhile, in various embodiments of the present disclosure, a channel may be replaced/substituted with a signal, or vice versa. For example, transmission/reception of a channel may include transmission/reception of a signal. For example, transmission/reception of a signal may include transmission/reception of a channel. For example, cast may be replaced/substituted with at least one of unicast, groupcast, and/or broadcast, or vice versa. For example, a cast type may be replaced/substituted with at least one of unicast, groupcast, and/or broadcast, or vice versa. For example, a cast or a cast type may include unicast, groupcast, and/or broadcast.

Meanwhile, in various embodiments of the present disclosure, a resource may be replaced/substituted with a slot or a symbol, or vice versa. For example, the resource may include a slot and/or a symbol.

Meanwhile, in various embodiments of the present disclosure, a priority may be replaced/substituted with at least one of logical channel prioritization (LCP), latency, reliability, minimum required communication range, prose per-packet priority (PPPP), sidelink radio bearer (SLRB), a QoS profile, a QoS parameter, and/or requirement, or vice versa.

Meanwhile, in various embodiments of the present disclosure, for example, for convenience of description, a (physical) channel used when a RX UE transmits at least one of the following information to a TX UE may be referred to as a PSFCH.

-   -   SL HARQ feedback, SL CSI, SL (L1) RSRP

Meanwhile, when performing sidelink communication, a method for a transmitting UE to reserve or pre-determine transmission resource(s) for receiving UE(s) may be representatively as follows.

For example, the transmitting UE may perform a reservation of transmission resource(s) based on a chain. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE may transmit location information for less than K transmission resources to receiving UE(s) through a SCI transmitted to the receiving UE(s) at any (or specific) transmission time or a time resource. That is, for example, the SCI may include location information for less than the K transmission resources. Alternatively, for example, if the transmitting UE reserves K transmission resources related to a specific TB, the transmitting UE may transmit location information for less than K transmission resources to receiving UE(s) through a SCI transmitted to the receiving UE(s) at any (or specific) transmission time or a time resource. That is, the SCI may include location information for less than the K transmission resources. In this case, for example, it is possible to prevent performance degradation due to an excessive increase in payloads of the SCI, by signaling only the location information for less than K transmission resources to the receiving UE(s) through one SCI transmitted at any (or specific) transmission time or the time resource by the transmitting UE.

FIG. 11 shows a method in which a UE that has reserved transmission resource(s) informs another UE of the transmission resource(s), based on an embodiment of the present disclosure. The embodiment of FIG. 11 may be combined with various embodiments of the present disclosure.

Specifically, for example, (a) of FIG. 11 shows a method for performing by a transmitting UE chain-based resource reservation by transmitting/signaling location information of (maximum) 2 transmission resources to receiving UE(s) through one SCI, in the case of a value of K=4. For example, (b) of FIG. 11 shows a method for performing by a transmitting UE chain-based resource reservation by transmitting/signaling location information of (maximum) 3 transmission resources to receiving UE(s) through one SCI, in the case of a value of K=4. For example, referring to (a) and (b) of FIG. 11 , the transmitting UE may transmit/signal only location information of the fourth transmission-related resource to the receiving UE(s) through the fourth (or last) transmission-related PSCCH. For example, referring to (a) of FIG. 11 , the transmitting UE may transmit/signal to the receiving UE(s) not only location information of the fourth transmission-related resource but also location information of the third transmission-related resource additionally through the fourth (or last) transmission-related PSCCH. For example, referring to (b) of FIG. 11 , the transmitting UE may transmit/signal to the receiving UE(s) not only location information of the fourth transmission-related resource but also location information of the second transmission-related resource and location information of the third transmission-related resource additionally through the fourth (or last) transmission-related PSCCH. In this case, for example, in (a) and (b) of FIG. 11 , if the transmitting UE may transmit/signal to the receiving UE(s) only location information of the fourth transmission-related resource through the fourth (or last) transmission-related PSCCH, the transmitting UE may configure or designate a field/bit of location information of unused or remaining transmission resource(s) to a pre-configured value (e.g., 0). For example, in (a) and (b) of FIG. 11 , if the transmitting UE may transmit/signal to the receiving UE(s) only location information of the fourth transmission-related resource through the fourth (or last) transmission-related PSCCH, the transmitting UE may be configured or designate a field/bit of location information of unused or remaining transmission resource(s) to a pre-configured status/bit value indicating/representing the last transmission (among 4 transmissions).

Meanwhile, for example, the transmitting UE may perform a reservation of transmission resource(s) based on a block. Specifically, for example, if the transmitting UE reserves K transmission resources, the transmitting UE may transmit location information for K transmission resources to receiving UE(s) through a SCI transmitted to the receiving UE(s) at any (or specific) transmission time or a time resource. That is, the SCI may include location information for K transmission resources. For example, if the transmitting UE reserves K transmission resources related to a specific TB, the transmitting UE may transmit location information for K transmission resources to receiving UE(s) through a SCI transmitted to the receiving UE(s) at any (or specific) transmission time or a time resource. That is, the SCI may include location information for K transmission resources. For example, (c) of FIG. 11 shows a method for performing by the transmitting UE block-based resource reservation, by signaling location information of 4 transmission resources to receiving UE(s) through one SCI, in the case of a value of K=4.

For example, according to the prior art, the following problems exist.

(1) For groupcast-based SL communication, when the participating UE(s) performs SL DRX operation, if an initial transmission and related resource selection of packet #X take into account even RSC_POOL within the extended SL DRX active time to be derived from the initial/retransmission of packet #Y, not only (other than) resources (RSC_POOL) belonging to a resource pool within the currently ongoing SL DRX active time, if the latter extended SL DRX active time does not actually exist (e.g., initial/retransmission of packet #Y overlaps with uplink transmission and is finally omitted), the problem may occur that the initial transmission of packet #X is not successfully delivered to the receiving UE(s) in the groupcast, and the transmission of packet #X is not completed within the linked PDB requirement because the receiving UE(s) in the groupcast cannot wake up. For example, the latter problem may be more serious than in the case of unicast, since transmission of a specific packet of groupcast must be successfully delivered to all participating receiving UE(s).

(2) For a UE performing an SL DRX operation, if the number of sensing occasions (e.g., PBPS) and the length of sensing duration (e.g., CPS) required for packet transmission-related candidate resource configuration of a UE that does not perform SL DRX operation is applied equally, a problem of a large amount of battery consumption may occur.

In order to solve the above problem, in the present disclosure, the following UE operation is proposed.

(1) When performing groupcast-based SL communication, packet-related initial transmission and related resource selection may be performed in consideration of only resources belonging to a resource pool within a currently ongoing SL DRX active time.

(2) For a UE performing SL DRX operation (compared to a UE not performing SL DRX operation), a partial sensing operation based on the number of different PBPS sensing occasions and the length of CPS sensing duration, may be enabled/disabled specifically for a resource pool.

For example, through the proposed method, (1) even if groupcast communication is performed under SL DRX operation, QoS requirements can be efficiently satisfied. Alternatively, the service can be efficiently supported. In addition, (2) the amount of battery consumed by the partial sensing operation of a UE performing an SL DRX operation can be effectively reduced.

According to an embodiment of the present disclosure, a time and/or a slot/radio frame type considered in SL communication is proposed below.

-   -   Option 1: Absolute time and/or slot/radio frame formed/defined         based on it, derived from a synchronization reference source         (selected by the UE) (and/or derived from synchronization         generated by the UE itself)     -   Option 2: In Option 1 related slot/radio frame, slots/radio         frames remaining after the pre-configured class/type of resource         (e.g., a reserved slot, a DL slot, an SL SSB slot, a slot that         does not satisfy the (pre-configured) number/position of SL         symbols, etc.) is excluded.

Here, for example, it may be interpreted that a resource pool bitmap is applied based on the (SL communication-related) slots/radio frames of option 2.

-   -   Option 3: When the resource pool bitmap (related to SL         communication) is applied to the option 2 related slots/radio         frames, slots/radio frames that actually belongs to the resource         pool (whose corresponding bit value is specified as “1”).

According to an embodiment of the present disclosure, when naming the number of SL slots (e.g., option 3) belonging to the resource pool that exists within SL DRX related active time (and/or on-duration) as “ACT_SLSLOTNUM”, i) if ACT_SLSLOTNUM is less than the minimum number of resources related to MAC PDU transmission (MIN_TXRSCNUM) that must be included/located within a pre-configured SL DRX-related active time and/or on-duration, and/or ii) if ACT_SLSLOTNUM is less than the (minimally) required/required number of resources (REQ_TXRSCNUM) for MAC PDU transmission, and/or iii) if the difference between ACT_SLSLOTNUM and MIN_TXRSCNUM (and/or REQ_TXRSCNUM) is less than a pre-configured threshold, and/or iv) when ACT_SLSLOTNUM is smaller than the number of slots (MIN_SELSIZE) corresponding to the minimum length (for example, configured for each priority) of a pre-configured selection window, whether to perform MAC PDU transmission and/or the number of (related) transmission resources may be determined according to the (part of) following rules. Here, for example, the rule may be limitedly applied when an SL DRX related cycle (and/or offset and/or timer) is configured based on option 1 (and/or option 2 and/or option 3).

For example, it may be configured to determine the number of resources related to MAC PDU transmission, and/or to omit MAC PDU transmission, in consideration of only ACT_SLSLOTNUM.

FIG. 12 shows an embodiment in which a transmitting UE selects a resource for groupcast communication, according to an embodiment of the present disclosure. The embodiment of FIG. 12 may be combined with various embodiments of the present disclosure.

Referring to FIG. 12 , a transmitting UE, a receiving UE 1, and a receiving UE 2 performing groupcast communication are shown. The three UEs performing groupcast communication may perform SL DRX operation based on the same SL DRX configuration. That is, a first SL DRX active time of FIG. 12 may be shared by the transmitting UE, the receiving UE 1, and the receiving UE 2. For example, the first SL DRX active time may be an active time based on a timer operating at the resource selection time of the transmitting UE.

For example, the transmitting UE may select a first SL resource, a second SL resource, and a third SL resource to transmit a MAC PDU to the receiving UE 1 and the receiving UE 2. Here, according to an embodiment of the present disclosure, the transmitting UE may select the first SL resource to be included in the first SL DRX active time. For example, the first SL resource may be the most advanced resource among resources selected by the resource selection.

For example, the second SL resource and the third SL resource may be selected to be included in the first SL DRX active time and/or the second SL DRX active time. For example, the second SL DRX active time may be an active time based on a timer started based on transmission performed based on the first SL resource. For example, the second SL resource and the third SL resource may be resources used for retransmission of a MAC PDU.

Referring to an embodiment of FIG. 12 , the first SL resource, the second SL resource, and the third SL resource are all included in the SL DRX active time as a result. Through this, groupcast communication can be performed smoothly during SL DRX operation, and this is an effect generated by selecting the transmission resource so that the first SL resource is included in the first SL DRX active time, and if the first SL resource was not included in the first SL DRX active time, transmission in the first SL resource as well as transmission in the second SL resource and the third SL resource may not be smoothly performed.

FIG. 13 shows a procedure for a transmitting UE to select a resource for groupcast communication according to an embodiment of the present disclosure. The embodiment of FIG. 13 may be combined with various embodiments of the present disclosure.

Referring to FIG. 13 , a transmitting UE, a receiving UE 1, and a receiving UE 2 performing groupcast communication are shown. In step S1310, the transmitting UE, the receiving UE 1, and the receiving UE 2 may obtain information related to SL DRX configuration. For example, the information related to the SL DRX configuration may include information on at least one SL DRX configuration related to QoS. One SL DRX configuration may be mapped to at least one QoS profile. For example, in FIG. 13 , SL DRX configuration 1 may be mapped to a first QoS profile and a second QoS profile, SL DRX configuration 2 may be mapped to a third QoS profile, and SL DRX configuration 3 may be mapped to a fourth QoS profile and a fifth QoS profile.

In step S1320, the transmitting UE, the receiving UE 1, and the receiving UE 2 may determine to use an SL DRX configuration mapped to a QoS profile related to a service to be performed through a groupcast. For example, in this embodiment, it is assumed that the transmitting UE, the receiving UE 1, and the receiving UE 2 perform a service related to a third QoS profile. That is, the transmitting UE, the receiving UE 1, and the receiving UE 2 may determine to use the SL DRX configuration 2.

In step S1330, the transmitting UE may select a plurality of transmission resources for transmitting a MAC PDU. Here, according to an embodiment of the present disclosure, a first SL resource, which is the first resource among the plurality of transmission resources, may be selected within an active time (a first SL DRX active time) of the resource selection time of the SL DRX configuration 2. For example, the first SL DRX active time may be a period in which a first timer related to an active time is running.

In step S1340, the transmitting UE may transmit the MAC PDU to the receiving UE 1 and the receiving UE 2 based on the first SL resource. For example, the transmitting UE may start a timer related to an active time based on the transmission of the MAC PDU. For example, the period in which a second timer related to an active time is running may be a second SL DRX active time. For example, resources (including the second SL resource) other than the first SL resource among the plurality of transmission resources may be selected to be included in the first SL DRX active time and/or the second SL DRX active time.

For example, the second timer related to the active time may be started based on the MAC PDU reception of the receiving UE 1 and the receiving UE 2. That is, a second timer may operate at the same time in the transmitting UE, the receiving UE 1, and the receiving UE 2, respectively.

In step S1350, the receiving UE 1 may transmit NACK information for the MAC PDU to the transmitting UE. For example, it is assumed that the groupcast is performed in a NACK-only manner within a HARQ feedback procedure.

In step S1360, the transmitting UE may perform retransmission of the MAC PDU based on the second SL resource based on the NACK information. For example, the second SL resource may not be included in the first SL DRX active time at the time of resource selection, but since it is included in the second SL DRX active time based on the operation of the second timer, the retransmission of the MAC PDU may be smoothly received by the receiving UE 1 and the receiving UE 2. That is, according to an embodiment of the present disclosure, based on the same understanding of the SL DRX active time of a plurality of UEs performing groupcast, groupcast communication may be smoothly received despite the SL DRX operation being performed.

According to an embodiment of the present disclosure, according to the difference value (DIFF_VAL) between ACT_SLSLOTNUM and MIN_TXRSCNUM (and/or REQ_TXRSCNUM and/or MIN_SELSIZE). ACT_SLSLOTNUM or MIN_TXRSCNUM (and/or REQ_TXRSCNUM and/or MIN_SELSIZE) values may be configured proportionally. Here, for example, for a (relatively) small DIFF_VAL value, The MIN_TXRSCNUM (and/or REQ_TXRSCNUM and/or MIN_SELSIZE) value may also be configured to be (relatively) small. If that rule applies, for example, the problem that a transmitting UE cannot perform a reception operation due to its transmission operation within the SL DRX-related active time (and/or on-duration) may be alleviated. Also, for example, the above rule may be limitedly applied when the SL DRX related cycle (and/or offset and/or timer) is configured based on option 1 (and/or option 2 and/or option 3).

According to an embodiment of the present disclosure, a UE (e.g., a receiving UE) may be configured to transfer the following (partial) auxiliary information to a UE (e.g., a transmitting UE) performing SL communication through a pre-defined signaling (e.g., PC5 RRC, MAC CE). Here, for example, when the corresponding rule is applied, a UE can accurately determine the location of an SL DRX-related active time (and/or on-duration) assumed/applied by the counterpart UE, in addition, based on this, selection/allocation of transmission resources becomes possible. In addition, when the counterpart UE sets its own SL DRX (pattern) related parameters, it can be identified based on which time (and/or resource pool) it is performed, in addition, it is possible to correctly apply its own SL DRX (pattern) configured by the counterpart UE. Also, for example, the proposed rule may be limitedly applied when the SL DRX related cycle (and/or offset and/or timer) is configured based on option 1 (and/or option 2 and/or option 3).

-   -   (SL communication related) DFN index (and/or SFN index)         information that it assumes/applies     -   (SL communication related) DFN index (and/or SFN index) offset         value information assumed/applied between itself and the         counterpart UE     -   information related to a (reception and/or transmission)         resource pool (SL slot (and/or SL resource)) which it         assumes/applies (for SL DRX operation) in a pre-defined         (absolute) time duration (e.g., 10240 ms) (and/or based on its         (and/or counterpart's) (SL communication-related) DFN 0) (e.g.,         (SL start/ending symbol related) location, the number of SL         symbols (constituting an SL slot), etc.)     -   SL DRX configuration (and/or a pattern and/or a parameter (e.g.,         the location/the length of an active time (and/or on-duration         and/or a cycle))) related (SL slot (and/or an SL resource))         information     -   (SL slot (and/or SL resource)) information related to a resource         (e.g., a reserved slot, a DL slot, an SL SSB slot, a slot which         do not satisfy the (pre-configured) number/the (pre-configured)         location of SL symbols) (to which a resource pool bitmap do not         applies)     -   (reception and/or transmission) resource pool index information         it assumes/applies (for SL DRX operation)     -   information regarding service (and/or (L2) destination ID         (and/or (L2) source ID) and/or QoS profile (and/or QoS flow ID))         class/type linked to a SL DRX (pattern) it assumes/applies     -   its synch reference source information (related to resource pool         application) (e.g., ID, an entity type)     -   Information related to whether it and the counterpart UE have         the same synchronous reference source (related to resource pool         application)

According to an embodiment of the present disclosure, a UE may be configured to apply an SL DRX related cycle (and/or offset and/or timer) based on a plurality of slot union set configured to itself, of (reception (and/or transmission)) resource pool related option 3 (and/or option 2 and/or option 1).

According to an embodiment of the present disclosure, an SL DRX related on-duration (and/or retransmission timer-based active time and/or RTT timer-based inactive time/sleep allowable duration) may be configured not to deviate from the (related) cycle region. Here, for example, if the rule applies, it may be interpreted (implicitly) that an on-duration timer (and/or a retransmission timer and/or an RTT timer) expires at the start of the next SL DRX cycle (and/or a subsequent SL DRX cycles with a pre-configured sequence number). Also, for example, the proposed rule may be limitedly applied when an SL DRX related cycle (and/or offset) is configured based on option 1 (and/or option 2), and an on-duration timer (and/or a retransmission timer and/or an RTT timer) is configured based on option 3 (and/or option 2).

According to an embodiment of the present disclosure, SL DRX cycle related offset parameter (and/or SL DRX on-duration related offset parameter) (OFF_VAL) (the start time of OFF_VAL within the SL DRX cycle length) may be configured to be randomized based on the following equation. Here, for example, FLOOR (X) is a function that derives the largest integer not greater than X, and MODULO (X, Y) is a function that derives the remainder of dividing X by Y. If the following suggested rules apply, it is possible to avoid that active times related to different service classes/types (and/or (L2) destination IDs (and/or (L2) source IDs and/or QoS profiles and/or QoS flow IDs)) overlap within an SL DRX cycle.

For example, L*{S MODULO FLOOR (N/L)} (or, L*{S MODULO the total number of candidates for OFF_VAL supported})

Here, for example, each parameter in the above formula may be defined/configured in the following meaning.

S: service type/class (and/or (L2) destination ID (and/or (L2) source ID) and/or QoS profile and/or QoS flow ID) related parameter (and/or identifier (partial bit))

L: (different service types/classes (and/or (L2) destination ID (and/or (L2) source ID and/or QoS profile and/or QoS flow ID) related parameter (and/or identifier) related) Interval between (different) OFF_VAL (start of application) (for example, it may include a symbol (and/or slot) granularity.) (within an SL DRX cycle)

Here, for example, L value may be configured to an (different service types/classes (and/or (L2) destination ID (and/or (L2) source ID and/or QoS profile and/or QoS flow ID) related parameter (and/or identifier) related) on-duration timer value (and/or length) (counted with a granularity equal to the L value)

Here, for example, the L value may be limitedly configured only to a (positive integer) W value that satisfies “N MODULO W=0”.

Here, for example, the L value may be configured to FLOOR (N/the total number of candidates for OFF_VAL supported) (e.g., if the calculation result value is ‘0’, it is assumed to be ‘1’) (or CEIL (N/the total number of candidates for OFF_VAL supported)). Also, for example, the total number of candidates for OFF_VAL supported may be (limitedly) configured only to a positive integer value less than or equal to N.

N: SL DRX cycle length (counted with granularity equal to L value)

According to an embodiment of the present disclosure, the following (partial) information-related parameter values (and/or whether to apply) may be configured differently, according to whether SL DRX is applied/performed (and/or SL DRX-related parameters (e.g., on-duration (and/or active time) length, cycle) and/or CBR value (measured within a resource pool) and/or (service-related) priority and/or service type/kind). In addition, for example, the following (partial) information-related parameter values (and/or whether to apply) may be configured differently for each of QoS profile (and/or QoS flow ID and/or QoS requirement (e.g. latency, reliability)) related to SL DRX operation (and/or pattern (e.g., cycle)).

-   -   contiguous partial sensing (CPS) (and/or periodic-based partial         sensing (PPS)) related sensing length (and/or the position         (and/or the number) of sensing occasion and/or whether being         enabled/applied)     -   (selectable) resource reservation periodicity candidate value     -   whether being enabled/disabled related to random resource         selection (and/or partial sensing based resource selection)

According to an embodiment of the present disclosure, when a UE (e.g., power saving UE) does not satisfy the sensing length (and/or the number of sensing occasions) required according to a pre-configured rule (due to SL DRX operation) and selects a transmission resource (e.g., if the sensing occasion is omitted because the (required) sensing occasion is located during the SL DRX inactivity time), the UE may inform other UEs of related (status) information through a predefined signal (e.g., a reserved bit on (1st) SCI).

For example, whether the rule (and/or the proposed method/rule-related parameter value of the present disclosure) is applied may be specifically (or differently, or independently) configured/allowed, for at least one (or not) of elements/parameters such as service type (and/or (LCH or service) priority and/or QOS requirements (e.g. delay, reliability, minimum coverage) and/or PQI parameters) and/or HARQ feedback enabled (and/or disabled) LCH/MAC PDU (transmission) and/or a CBR measurement value and/or an SL cast type of a resource pool (for example, unicast, groupcast, broadcast) and/or SL groupcast HARQ feedback option (e.g., NACK only feedback, ACK/NACK feedback, TX-RX distance-based NACK only feedback) and/or SL mode 1 CG type (e.g., SL CG type 1/2) and/or SL mode type (e.g., mode 1/2) and/or a resource pool and/or whether a PSFCH resource is configured to a resource pool and/or a source (L2) ID (and/or a destination (L2) ID) and/or PC5 RRC connection link and/or an SL link and/or a connection state (between a base station) (for example, RRC CONNECTED state, IDLE state, INACTIVE state) and/or an SL HARQ process (ID) and/or whether an SL DRX operation (of a transmitting UE or a receiving UE) is performed and/or whether it is a power saving (transmitting or receiving) UE and/or when PSFCH transmission and PSFCH reception (and/or a plurality of PSFCH transmissions (exceeding UE capability)) overlap (from a specific UE perspective)(and/or when PSFCH transmission (and/or PSFCH reception) is omitted) and/or when a receiving UE actually (successfully) receives PSCCH (and/or PSSCH) (re)transmission from a transmitting UE, etc.

In addition, in the present disclosure, the wording “configuration” (or “designation”) may be extended and interpreted as a form in which a base station informs a UE through a pre-defined (physical layer or higher layer) channel/signal (e.g., SIB. RRC. MAC CE) (and/or, a form that it is provided through pre-configuration, and/or a form in which a UE informs other UEs through a predefined (physical layer or higher layer) channel/signal (e.g., SL MAC CE, PC5 RRC)).

In addition, in this disclosure, “PSFCH” wording may be interpreted as (mutually) extended to “(NR or LTE) PSSCH (and/or (NR or LTE) PSCCH) (and/or (NR or LTE) SL SSB (and/or UL channel/signal))”.

In addition, the methods proposed in the present disclosure may be used in combination with each other (in a new type of method).

According to the existing technology, when selecting a resource, the first resource may not exist within the SL DRX active time shared in groupcast, so there is a possibility that groupcast communication may not be smoothly performed according to an SL DRX operation. On the other hand, according to an embodiment of the present disclosure, since the first resource is selected within an SL DRX active time, groupcast communication may be smoothly performed despite performing an SL DRX operation.

FIG. 14 shows a procedure in which a first device performs wireless communication, according to an embodiment of the present disclosure. The embodiment of FIG. 14 may be combined with various embodiments of the present disclosure.

Referring to FIG. 14 , in step S1410, a first device may obtain information related to a resource pool. In step S1420, the first device may obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time. In step S1430, the first device may generate a medium access control (MAC) protocol data unit (PDU) related to a groupcast transmission. In step S1440, the first device may select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing. For example, a first SL resource included in the at least one SL resource may be included in the first SL DRX active time. For example, the first SL resource being selected outside the first SL DRX active time may be not allowed, based on the MAC PDU being related to groupcast transmission.

For example, the first timer may include an on duration timer.

For example, the first SL resource may be a resource for an initial transmission of the MAC PDU.

For example, at least one second resource included in the at least one SL resource may be included in the first SL DRX active time or a second SL DRX active time, and a second timer related to the second SL DRX active time may be not running at the time of selecting the at least one SL resource.

For example, a timer for the second SL DRX active time may be started based on a destination layer (L)2 ID related to the MAC PDU.

For example, the at least one second SL resource may be a resource for a retransmission.

For example, the sensing may be periodic based partial sensing (PBPS), and the PBPS may be performed for at least one PBPS sensing occasion.

For example, a number of the at least one PBPS sensing occasion may be configured based on whether the first device performs an SL DRX operation.

For example, the information related to the resource pool may include information related to the number of at least one PBPS sensing occasion

For example, the sensing may be contiguous partial sensing (CPS), and the CPS may be performed for at least one CPS sensing slot.

For example, a number of the at least one CPS sensing slot may be configured based on whether the first device performs an SL DRX operation.

For example, the information related to the resource pool may include information related to the number of the at least one CPS sensing slot.

For example, the first timer for the first SL DRX active time may be running at the time of selecting the at least one SL resource.

The above-described embodiment can be applied to various devices to be described below. First, a processor 102 of a first device may obtain information related to a resource pool. And, the processor 102 of the first device may obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time. And, the processor 102 of the first device may generate a medium access control (MAC) protocol data unit (PDU) related to a groupcast transmission. And, the processor 102 of the first device may select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing. For example, a first SL resource included in the at least one SL resource may be included in the first SL DRX active time. For example, the first SL resource being selected outside the first SL DRX active time may be not allowed, based on the MAC PDU being related to groupcast transmission.

According to an embodiment of the present disclosure, a first device for performing wireless communication may be proposed. For example, the first device may comprise: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: obtain information related to a resource pool; obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generate a medium access control (MAC) protocol data unit (PDU) related to a groupcast transmission; and select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

For example, the first timer may include an on duration timer.

For example, the first SL resource may be a resource for an initial transmission of the MAC PDU.

For example, at least one second resource included in the at least one SL resource may be included in the first SL DRX active time or a second SL DRX active time, and a second timer related to the second SL DRX active time may be not running at the time of selecting the at least one SL resource.

For example, a timer for the second SL DRX active time may be started based on a destination layer (L)2 ID related to the MAC PDU.

For example, the at least one second SL resource may be a resource for a retransmission.

For example, the sensing may be periodic based partial sensing (PBPS), and the PBPS may be performed for at least one PBPS sensing occasion.

For example, a number of the at least one PBPS sensing occasion may be configured based on whether the first device performs an SL DRX operation.

For example, the information related to the resource pool may include information related to the number of at least one PBPS sensing occasion

For example, the sensing may be contiguous partial sensing (CPS), and the CPS may be performed for at least one CPS sensing slot.

For example, a number of the at least one CPS sensing slot may be configured based on whether the first device performs an SL DRX operation.

For example, the information related to the resource pool may include information related to the number of the at least one CPS sensing slot.

For example, the first timer for the first SL DRX active time may be running at the time of selecting the at least one SL resource.

According to an embodiment of the present disclosure, a device adapted to control a first user equipment (UE) may be proposed. For example, the device may comprise: one or more processors; and one or more memories operably connectable to the one or more processors and storing instructions. For example, the one or more processors may execute the instructions to: obtain information related to a resource pool; obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generate a medium access control (MAC) protocol data unit (PDU) related to a groupcast transmission; and select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

According to an embodiment of the present disclosure, a non-transitory computer-readable storage medium storing instructions may be proposed. For example, the instructions, when executed, may cause a first device to: obtain information related to a resource pool; obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generate a medium access control (MAC) protocol data unit (PDU) related to a groupcast transmission; and select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

FIG. 15 shows a procedure in which a second device performs wireless communication, according to an embodiment of the present disclosure. The embodiment of FIG. 15 may be combined with various embodiments of the present disclosure.

Referring to FIG. 15 , in step S1510, a second device may obtain information related to a resource pool. In step S1520, the second device may obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time. In step S1530, the second device may receive first sidelink control information (SCI), from a first device, for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), based on a first SL resource, in a first SL DRX active time of the SL DRX configuration. In step S1540, the second device may receive a medium access control (MAC) protocol data unit (PDU) related to groupcast transmission and second SCI, from the first device, through the PSSCH, based on the first SL resource, in the first SL DRX active time. In step S1550, the second device may start a timer related to a second SL DRX active time based on the first SCI and the second SCI. For example, the first SL resource may be included in the first SL DRX active time, at least one SL resource including the first SL resource may be selected among a plurality of candidate resources in the resource pool based on sensing, and the first SL resource being selected outside the first SL DRX active time may be not allowed, based on the MAC PDU being related to groupcast transmission.

For example, at least one second SL resource included in the at least one SL resource may be selected to be included in the first SL DRX active time or the second SL DRX active time, and a second timer related to the second SL DRX active time may be not running at the time of selecting the at least one SL resource.

The above-described embodiment may be applied to various devices to be described below. First, a processor 202 of a second device 200 may obtain information related to a resource pool. And, the processor 202 of the second device 200 may obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time. And, the processor 202 of the second device 200 may control a transceiver 206 to receive first sidelink control information (SCI), from a first device 10, for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), based on a first SL resource, in a first SL DRX active time of the SL DRX configuration. And, the processor 202 of the second device 200 may control the transceiver 206 to receive a medium access control (MAC) protocol data unit (PDU) related to groupcast transmission and second SCI, from the first device 100, through the PSSCH, based on the first SL resource, in the first SL DRX active time. And, the processor 202 of the second device 200 may start a timer related to a second SL DRX active time based on the first SCI and the second SCI. For example, the first SL resource may be included in the first SL DRX active time, at least one SL resource including the first SL resource may be selected among a plurality of candidate resources in the resource pool based on sensing, and the first SL resource being selected outside the first SL DRX active time may be not allowed, based on the MAC PDU being related to groupcast transmission.

According to an embodiment of the present disclosure, a second device for performing wireless communication may be proposed. For example, the second device may comprise: one or more memories storing instructions; one or more transceivers, and one or more processors connected to the one or more memories and the one or more transceivers. For example, the one or more processors may execute the instructions to: obtain information related to a resource pool: obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; receive first sidelink control information (SCI), from a first device, for scheduling a physical sidelink shared channel (PSSCH) through a physical sidelink control channel (PSCCH), based on a first SL resource, in a first SL DRX active time of the SL DRX configuration: receive a medium access control (MAC) protocol data unit (PDU) related to groupcast transmission and second SCI, from the first device, through the PSSCH, based on the first SL resource, in the first SL DRX active time; and start a timer related to a second SL DRX active time based on the first SCI and the second SCI, wherein the first SL resource is included in the first SL DRX active time, wherein at least one SL resource including the first SL resource is selected among a plurality of candidate resources in the resource pool based on sensing, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.

For example, at least one second SL resource included in the at least one SL resource may be selected to be included in the first SL DRX active time or the second SL DRX active time, and a second timer related to the second SL DRX active time may be not running at the time of selecting the at least one SL resource.

Various embodiments of the present disclosure may be combined with each other.

Hereinafter, device(s) to which various embodiments of the present disclosure can be applied will be described.

The various descriptions, functions, procedures, proposals, methods, and/or operational flowcharts of the present disclosure described in this document may be applied to, without being limited to, a variety of fields requiring wireless communication/connection (e.g., 5G) between devices.

Hereinafter, a description will be given in more detail with reference to the drawings. In the following drawings/description, the same reference symbols may denote the same or corresponding hardware blocks, software blocks, or functional blocks unless described otherwise.

FIG. 16 shows a communication system 1, based on an embodiment of the present disclosure.

Referring to FIG. 16 , a communication system 1 to which various embodiments of the present disclosure are applied includes wireless devices, Base Stations (BSs), and a network. Herein, the wireless devices represent devices performing communication using Radio Access Technology (RAT)(e.g., 5G New RAT (NR)) or Long-Term Evolution (LTE)) and may be referred to as communication/radio/5G devices. The wireless devices may include, without being limited to, a robot 100 a, vehicles 100 b-1 and 100 b-2, an eXtended Reality (XR) device 100 c, a hand-held device 100 d, a home appliance 100 e, an Internet of Things (IoT) device 100 f, and an Artificial Intelligence (AI) device/server 400. For example, the vehicles may include a vehicle having a wireless communication function, an autonomous vehicle, and a vehicle capable of performing communication between vehicles. Herein, the vehicles may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may include an Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) device and may be implemented in the form of a Head-Mounted Device (HMD), a Head-Up Display (HUD) mounted in a vehicle, a television, a smartphone, a computer, a wearable device, a home appliance device, a digital signage, a vehicle, a robot, etc. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), and a computer (e.g., a notebook). The home appliance may include a T, a refrigerator, and a washing machine. The IoT device may include a sensor and a smartmeter. For example, the BSs and the network may be implemented as wireless devices and a specific wireless device 200 a may operate as a BS/network node with respect to other wireless devices.

Here, wireless communication technology implemented in wireless devices 100 a to 100 f of the present disclosure may include Narrowband Internet of Things for low-power communication in addition to LTE, NR, and 6G. In this case, for example, NB-IoT technology may be an example of Low Power Wide Area Network (LPWAN) technology and may be implemented as standards such as LTE Cat NB1, and/or LTE Cat NB2, and is not limited to the name described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100 a to 100 f of the present disclosure may perform communication based on LTE-M technology. In this case, as an example, the LTE-M technology may be an example of the LPWAN and may be called by various names including enhanced Machine Type Communication (eMTC), and the like. For example, the LTE-M technology may be implemented as at least any one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-Bandwidth Limited (non-BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) LTE M. and is not limited to the name described above. Additionally or alternatively, the wireless communication technology implemented in the wireless devices 100 a to 100 f of the present disclosure may include at least one of Bluetooth, Low Power Wide Area Network (LPWAN), and ZigBee considering the low-power communication, and is not limited to the name described above. As an example, the ZigBee technology may generate personal area networks (PAN) related to small/low-power digital communication based on various standards including IEEE 802.15.4, and the like, and may be called by various names.

The wireless devices 100 a to 100 f may be connected to the network 300 via the BSs 200. An AI technology may be applied to the wireless devices 100 a to 100 f and the wireless devices 100 a to 100 f may be connected to the AI server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100 a to 100 f may communicate with each other through the BSs 200/network 300, the wireless devices 100 a to 100 f may perform direct communication (e.g., sidelink communication) with each other without passing through the BSs/network. For example, the vehicles 100 b-1 and 100 b-2 may perform direct communication (e.g. Vehicle-to-Vehicle (V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may be established between the wireless devices 100 a to 100 f/BS 200, or BS 200/BS 200. Herein, the wireless communication/connections may be established through various RATs (e.g., 5G NR) such as uplink/downlink communication 150 a, sidelink communication 150 b (or, D2D communication), or inter BS communication (e.g. relay, Integrated Access Backhaul (IAB)). The wireless devices and the BSs/the wireless devices may transmit/receive radio signals to/from each other through the wireless communication/connections 150 a and 150 b. For example, the wireless communication/connections 150 a and 150 b may transmit/receive signals through various physical channels. To this end, at least a part of various configuration information configuring processes, various signal processing processes (e.g., channel encoding/decoding, modulation/demodulation, and resource mapping/demapping), and resource allocating processes, for transmitting/receiving radio signals, may be performed based on the various proposals of the present disclosure.

FIG. 17 shows wireless devices, based on an embodiment of the present disclosure.

Referring to FIG. 17 , a first wireless device 100 and a second wireless device 200 may transmit radio signals through a variety of RATs (e.g., LTE and NR). Herein, {the first wireless device 100 and the second wireless device 200} may correspond to {the wireless device 100 x and the BS 200} and/or {the wireless device 100 x and the wireless device 100 x} of FIG. 16 .

The first wireless device 100 may include one or more processors 102 and one or more memories 104 and additionally further include one or more transceivers 106 and/or one or more antennas 108. The processor(s) 102 may control the memory(s) 104 and/or the transceiver(s) 10 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. For example, the processor(s) 102 may process information within the memory(s) 104 to generate first information/signals and then transmit radio signals including the first information/signals through the transceiver(s) 106. The processor(s) 102 may receive radio signals including second information/signals through the transceiver 106 and then store information obtained by processing the second information/signals in the memory(s) 104. The memory(s) 104 may be connected to the processor(s) 102 and may store a variety of information related to operations of the processor(s) 102. For example, the memory(s) 104 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 102 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. Herein, the processor(s) 102 and the memory(s) 104 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 106 may be connected to the processor(s) 102 and transmit and/or receive radio signals through one or more antennas 108. Each of the transceiver(s) 106 may include a transmitter and/or a receiver. The transceiver(s) 106 may be interchangeably used with Radio Frequency (RF) unit(s). In the present disclosure, the wireless device may represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202 and one or more memories 204 and additionally further include one or more transceivers 206 and/or one or more antennas 208. The processor(s) 202 may control the memory(s) 204 and/or the transceiver(s) 206 and may be configured to implement the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. For example, the processor(s) 202 may process information within the memory(s) 204 to generate third information/signals and then transmit radio signals including the third information/signals through the transceiver(s) 206. The processor(s) 202 may receive radio signals including fourth information/signals through the transceiver(s) 106 and then store information obtained by processing the fourth information/signals in the memory(s) 204. The memory(s) 204 may be connected to the processor(s) 202 and may store a variety of information related to operations of the processor(s) 202. For example, the memory(s) 204 may store software code including commands for performing a part or the entirety of processes controlled by the processor(s) 202 or for performing the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. Herein, the processor(s) 202 and the memory(s) 204 may be a part of a communication modem/circuit/chip designed to implement RAT (e.g., LTE or NR). The transceiver(s) 206 may be connected to the processor(s) 202 and transmit and/or receive radio signals through one or more antennas 208. Each of the transceiver(s) 206 may include a transmitter and/or a receiver. The transceiver(s) 206 may be interchangeably used with RF unit(s). In the present disclosure, the wireless device may represent a communication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 will be described more specifically. One or more protocol layers may be implemented by, without being limited to, one or more processors 102 and 202. For example, the one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). The one or more processors 102 and 202 may generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Unit (SDUs) according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document. The one or more processors 102 and 202 may generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document and provide the generated signals to the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive the signals (e.g., baseband signals) from the one or more transceivers 106 and 206 and acquire the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in the one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software and the firmware or software may be configured to include the modules, procedures, or functions. Firmware or software configured to perform the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be included in the one or more processors 102 and 202 or stored in the one or more memories 104 and 204 so as to be driven by the one or more processors 102 and 202. The descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, code, instructions, and/or commands. The one or more memories 104 and 204 may be configured by Read-Only Memories (ROMs). Random Access Memories (RAMs), Electrically Erasable Programmable Read-Only Memories (EPROMs), flash memories, hard drives, registers, cash memories, computer-readable storage media, and/or combinations thereof. The one or more memories 104 and 204 may be located at the interior and/or exterior of the one or more processors 102 and 202. The one or more memories 104 and 204 may be connected to the one or more processors 102 and 202 through various technologies such as wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, control information, and/or radio signals/channels, mentioned in the methods and/or operational flowcharts of this document, to one or more other devices. The one or more transceivers 106 and 206 may receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, from one or more other devices. For example, the one or more transceivers 106 and 206 may be connected to the one or more processors 102 and 202 and transmit and receive radio signals. For example, the one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may transmit user data, control information, or radio signals to one or more other devices. The one or more processors 102 and 202 may perform control so that the one or more transceivers 106 and 206 may receive user data, control information, or radio signals from one or more other devices. The one or more transceivers 106 and 206 may be connected to the one or more antennas 108 and 208 and the one or more transceivers 106 and 206 may be configured to transmit and receive user data, control information, and/or radio signals/channels, mentioned in the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document, through the one or more antennas 108 and 208. In this document, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports). The one or more transceivers 106 and 206 may convert received radio signals/channels etc. from RF band signals into baseband signals in order to process received user data, control information, radio signals/channels, etc. using the one or more processors 102 and 202. The one or more transceivers 106 and 206 may convert the user data, control information, radio signals/channels, etc. processed using the one or more processors 102 and 202 from the base band signals into the RF band signals. To this end, the one or more transceivers 106 and 206 may include (analog) oscillators and/or filters.

FIG. 18 shows a signal process circuit for a transmission signal, based on an embodiment of the present disclosure.

Referring to FIG. 18 , a signal processing circuit 1000 may include scramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040, resource mappers 1050, and signal generators 1060. An operation/function of FIG. 18 may be performed, without being limited to, the processors 102 and 202 and/or the transceivers 106 and 206 of FIG. 17 . Hardware elements of FIG. 18 may be implemented by the processors 102 and 202 and/or the transceivers 106 and 206 of FIG. 17 . For example, blocks 1010 to 1060 may be implemented by the processors 102 and 202 of FIG. 17 . Alternatively, the blocks 1010 to 1050 may be implemented by the processors 102 and 202 of FIG. 17 and the block 1060 may be implemented by the transceivers 106 and 206 of FIG. 17 .

Codewords may be converted into radio signals via the signal processing circuit 1000 of FIG. 18 . Herein, the codewords are encoded bit sequences of information blocks. The information blocks may include transport blocks (e.g., a UL-SCH transport block, a DL-SCH transport block). The radio signals may be transmitted through various physical channels (e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bit sequences by the scramblers 1010. Scramble sequences used for scrambling may be generated based on an initialization value, and the initialization value may include ID information of a wireless device. The scrambled bit sequences may be modulated to modulation symbol sequences by the modulators 1020. A modulation scheme may include pi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying (m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complex modulation symbol sequences may be mapped to one or more transport layers by the layer mapper 1030. Modulation symbols of each transport layer may be mapped (precoded) to corresponding antenna port(s) by the precoder 1040. Outputs z of the precoder 1040 may be obtained by multiplying outputs y of the layer mapper 1030 by an N*M precoding matrix W. Herein. N is the number of antenna ports and M is the number of transport layers. The precoder 1040 may perform precoding after performing transform precoding (e.g., DFT) for complex modulation symbols. Alternatively, the precoder 1040 may perform precoding without performing transform precoding.

The resource mappers 1050 may map modulation symbols of each antenna port to time-frequency resources. The time-frequency resources may include a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMA symbols) in the time domain and a plurality of subcarriers in the frequency domain. The signal generators 1060 may generate radio signals from the mapped modulation symbols and the generated radio signals may be transmitted to other devices through each antenna. For this purpose, the signal generators 1060 may include Inverse Fast Fourier Transform (IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-Analog Converters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wireless device may be configured in a reverse manner of the signal processing procedures 1010 to 1060 of FIG. 18 . For example, the wireless devices (e.g., 100 and 200 of FIG. 17 ) may receive radio signals from the exterior through the antenna ports/transceivers. The received radio signals may be converted into baseband signals through signal restorers. To this end, the signal restorers may include frequency downlink converters, Analog-to-Digital Converters (ADCs), CP remover, and Fast Fourier Transform (FFT) modules. Next, the baseband signals may be restored to codewords through a resource demapping procedure, a postcoding procedure, a demodulation processor, and a descrambling procedure. The codewords may be restored to original information blocks through decoding. Therefore, a signal processing circuit (not illustrated) for a reception signal may include signal restorers, resource demappers, a postcoder, demodulators, descramblers, and decoders.

FIG. 19 shows another example of a wireless device, based on an embodiment of the present disclosure. The wireless device may be implemented in various forms according to a use-case/service (refer to FIG. 16 ).

Referring to FIG. 19 , wireless devices 100 and 200 may correspond to the wireless devices 100 and 200 of FIG. 17 and may be configured by various elements, components, units/portions, and/or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional components 140. The communication unit may include a communication circuit 112 and transceiver(s) 114. For example, the communication circuit 112 may include the one or more processors 102 and 202 and/or the one or more memories 104 and 204 of FIG. 17 . For example, the transceiver(s) 114 may include the one or more transceivers 106 and 206 and/or the one or more antennas 108 and 208 of FIG. 17 . The control unit 120 is electrically connected to the communication unit 110, the memory 130, and the additional components 140 and controls overall operation of the wireless devices. For example, the control unit 120 may control an electric/mechanical operation of the wireless device based on programs/code/commands/information stored in the memory unit 130. The control unit 120 may transmit the information stored in the memory unit 130 to the exterior (e.g., other communication devices) via the communication unit 110 through a wireless/wired interface or store, in the memory unit 130, information received through the wireless/wired interface from the exterior (e.g., other communication devices) via the communication unit 110.

The additional components 140 may be variously configured according to types of wireless devices. For example, the additional components 140 may include at least one of a power unit/battery, input/output (I/O) unit, a driving unit, and a computing unit. The wireless device may be implemented in the form of, without being limited to, the robot (100 a of FIG. 16 ), the vehicles (100 b-1 and 100 b-2 of FIG. 16 ), the XR device (100 c of FIG. 16 ), the hand-held device (100 d of FIG. 16 ), the home appliance (100 e of FIG. 16 ), the IoT device (100 f of FIG. 16 ), a digital broadcast terminal, a hologram device, a public safety device, an MTC device, a medicine device, a fintech device (or a finance device), a security device, a climate/environment device, the AI server/device (400 of FIG. 16 ), the BSs (200 of FIG. 16 ), a network node, etc. The wireless device may be used in a mobile or fixed place according to a use-example/service.

In FIG. 19 , the entirety of the various elements, components, units/portions, and/or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be connected by wire and the control unit 120 and first units (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. Each element, component, unit/portion, and/or module within the wireless devices 100 and 200 may further include one or more elements. For example, the control unit 120 may be configured by a set of one or more processors. As an example, the control unit 120 may be configured by a set of a communication control processor, an application processor, an Electronic Control Unit (ECU), a graphical processing unit, and a memory control processor. As another example, the memory 130 may be configured by a Random Access Memory (RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory, a volatile memory, a non-volatile memory, and/or a combination thereof.

Hereinafter, an example of implementing FIG. 19 will be described in detail with reference to the drawings.

FIG. 20 shows a hand-held device, based on an embodiment of the present disclosure. The hand-held device may include a smartphone, a smartpad, a wearable device (e.g., a smartwatch or a smartglasses), or a portable computer (e.g., a notebook). The hand-held device may be referred to as a mobile station (MS), a user terminal (UT), a Mobile Subscriber Station (MSS), a Subscriber Station (SS), an Advanced Mobile Station (AMS), or a Wireless Terminal (WT).

Referring to FIG. 20 , a hand-held device 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140 a, an interface unit 140 b, and an I/O unit 140 c. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130/140 a to 140 c correspond to the blocks 110 to 130/140 of FIG. 19 , respectively.

The communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from other wireless devices or BSs. The control unit 120 may perform various operations by controlling constituent elements of the hand-held device 100. The control unit 120 may include an Application Processor (AP). The memory unit 130 may store data/parameters/programs/code/commands needed to drive the hand-held device 100. The memory unit 130 may store input/output data/information. The power supply unit 140 a may supply power to the hand-held device 100 and include a wired/wireless charging circuit, a battery, etc. The interface unit 140 b may support connection of the hand-held device 100 to other external devices. The interface unit 140 b may include various ports (e.g., an audio I/O port and a video I/O port) for connection with external devices. The I/O unit 140 c may input or output video information/signals, audio information/signals, data, and/or information input by a user. The I/O unit 140 c may include a camera, a microphone, a user input unit, a display unit 140 d, a speaker, and/or a haptic module.

As an example, in the case of data communication, the I/O unit 140 c may acquire information/signals (e.g., touch, text, voice, images, or video) input by a user and the acquired information/signals may be stored in the memory unit 130. The communication unit 110 may convert the information/signals stored in the memory into radio signals and transmit the converted radio signals to other wireless devices directly or to a BS. The communication unit 110 may receive radio signals from other wireless devices or the BS and then restore the received radio signals into original information/signals. The restored information/signals may be stored in the memory unit 130 and may be output as various types (e.g., text, voice, images, video, or haptic) through the I/O unit 140 c.

FIG. 21 shows a vehicle or an autonomous vehicle, based on an embodiment of the present disclosure. The vehicle or autonomous vehicle may be implemented by a mobile robot, a car, a train, a manned/unmanned Aerial Vehicle (AV), a ship, etc.

Referring to FIG. 21 , a vehicle or autonomous vehicle 100 may include an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140 a, a power supply unit 140 b, a sensor unit 140 c, and an autonomous driving unit 140 d. The antenna unit 108 may be configured as a part of the communication unit 110. The blocks 110/130/140 a to 140 d correspond to the blocks 110/130/140 of FIG. 19 , respectively.

The communication unit 110 may transmit and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and road side units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The control unit 120 may include an Electronic Control Unit (ECU). The driving unit 140 a may cause the vehicle or the autonomous vehicle 100 to drive on a road. The driving unit 140 a may include an engine, a motor, a powertrain, a wheel, a brake, a steering device, etc. The power supply unit 140 b may supply power to the vehicle or the autonomous vehicle 100 and include a wired/wireless charging circuit, a battery, etc. The sensor unit 140 c may acquire a vehicle state, ambient environment information, user information, etc. The sensor unit 140 c may include an Inertial Measurement Unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward/backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illumination sensor, a pedal position sensor, etc. The autonomous driving unit 140 d may implement technology for maintaining a lane on which a vehicle is driving, technology for automatically adjusting speed, such as adaptive cruise control, technology for autonomously driving along a determined path, technology for driving by automatically setting a path if a destination is set, and the like.

For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140 d may generate an autonomous driving path and a driving plan from the obtained data. The control unit 120 may control the driving unit 140 a such that the vehicle or the autonomous vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed/direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically/periodically acquire recent traffic information data from the external server and acquire surrounding traffic information data from neighboring vehicles. In the middle of autonomous driving, the sensor unit 140 c may obtain a vehicle state and/or surrounding environment information. The autonomous driving unit 140 d may update the autonomous driving path and the driving plan based on the newly obtained data/information. The communication unit 110 may transfer information about a vehicle position, the autonomous driving path, and/or the driving plan to the external server. The external server may predict traffic information data using AI technology, etc., based on the information collected from vehicles or autonomous vehicles and provide the predicted traffic information data to the vehicles or the autonomous vehicles.

Claims in the present description can be combined in a various way. For instance, technical features in method claims of the present description can be combined to be implemented or performed in an apparatus, and technical features in apparatus claims can be combined to be implemented or performed in a method. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in an apparatus. Further, technical features in method claim(s) and apparatus claim(s) can be combined to be implemented or performed in a method. 

1. A method for performing, by a first device, wireless communication, the method comprising: obtaining information related to a resource pool; obtaining a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generating a medium access control (MAC) protocol data unit (PDU) related to groupcast communication; and selecting at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.
 2. The method of claim 1, wherein the first timer includes an on duration timer.
 3. The method of claim 1, wherein the first SL resource is a resource for an initial transmission of the MAC PDU.
 4. The method of claim 1, wherein at least one second resource included in the at least one SL resource is included in the first SL DRX active time or a second SL DRX active time, and wherein a second timer related to the second SL DRX active time is not running at the time of selecting the at least one SL resource.
 5. The method of claim 4, wherein a timer for the second SL DRX active time is started based on a destination layer (L)2 ID related to the MAC PDU.
 6. The method of claim 4, wherein the at least one second SL resource is a resource for a retransmission.
 7. The method of claim 1, wherein the sensing is periodic based partial sensing (PBPS), and wherein the PBPS is performed for at least one PBPS sensing occasion.
 8. The method of claim 7, wherein a number of the at least one PBPS sensing occasion is configured based on whether the first device performs an SL DRX operation.
 9. The method of claim 7, wherein the information related to the resource pool includes information related to the number of at least one PBPS sensing occasion
 10. The method of claim 1, wherein the sensing is contiguous partial sensing (CPS), and wherein the CPS is performed for at least one CPS sensing slot.
 11. The method of claim 10, wherein a number of the at least one CPS sensing slot is configured based on whether the first device performs an SL DRX operation.
 12. The method of claim 10, wherein the information related to the resource pool includes information related to the number of the at least one CPS sensing slot.
 13. The method of claim 1, wherein the first timer for the first SL DRX active time is running at the time of selecting the at least one SL resource.
 14. A first device for performing wireless communication, the first device comprising: one or more memories storing instructions; one or more transceivers; and one or more processors connected to the one or more memories and the one or more transceivers, wherein the one or more processors execute the instructions to: obtain information related to a resource pool; obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generate a medium access control (MAC) protocol data unit (PDU) related to groupcast communication; and select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission.
 15. A device adapted to control a first user equipment (UE), the device comprising: one or more processors; and one or more memories operably connectable to the one or more processors and storing instructions, wherein the one or more processors execute the instructions to: obtain information related to a resource pool; obtain a sidelink (SL) discontinuous reception (DRX) configuration including information related to a SL DRX cycle and information related to a plurality of timers including a first timer for a first SL DRX active time; generate a medium access control (MAC) protocol data unit (PDU) related to groupcast communication; and select at least one SL resource for a transmission of the MAC PDU among a plurality of candidate resources in the resource pool, based on sensing, wherein a first SL resource included in the at least one SL resource is included in the first SL DRX active time, and wherein the first SL resource being selected outside the first SL DRX active time is not allowed, based on the MAC PDU being related to groupcast transmission. 16-20. (canceled) 